SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5709db68d08b633e528a7408319f5f6ecc376738d9c44add261f2cea41f58cf' 
  AND token = 'wM+F2NbN3tnpuPuqTbKFNXwn9CmdZ0Z1ZN6+HOJZZrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}